/Engine/Plugins/Experimental/TextToSpeech/Source/TextToSpeech/Public/TextToSpeechEngineSubsystem.h
Returns the number of text to speech channels that have been added.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=TextToSpeech, Meta=(DisplayName="Get Number Of Channels")) int32 GetNumChannels() const